Package for microwave device

Abstract

A package has two microwave input terminals to which a protection circuit for protecting a microwave device from electrostatic breakdown is connected and another microwave input terminal to which no protection circuit is connected. The protection circuit includes a microstrip line having a length equal to a quarter wavelength at the frequency of a signal to be amplified and a diode having one terminal connected to the microstrip line and the other terminal grounded.

What is claimed is: 
     
       1. A package in which a microwave device is to be mounted, said package comprising: a protection circuit for protecting said microwave device from electrostatic breakdown;   a microstrip line having a length equal to a quarter wavelength at a frequency of an input signal, which is to be inputted to said microwave device;   a first terminal connected to said microstrip line; and   a capacitor connected between said microstrip line and a ground potential;   a first input terminal connected to said protection circuit and first terminal; and   a second input terminal; wherein one, and only one, of said first and second input terminals is selectively connected to said microwave device, thereby causing said protection circuit to be selectively connected to said microwave device.   
     
     
       2. The package of claim 1, wherein said protection circuit comprises: a diode;   a second terminal connecting said diode to said microstrip line; and   a third terminal connecting said diode to said ground potential.   
     
     
       3. A package in which a microwave device is to be mounted, said package comprising: a first input terminal;   a second input terminal; and   a protection circuit, connected to said first input terminal, for protecting said microwave device from electrostatic breakdown, said protection circuit comprising; a microstrip line having a length equal to a quarter wavelength at a frequency of an input signal, which is to be inputted to said microwave device;   a terminal connecting said microstrip line to said first input terminal;   a first diode having an anode connected to said microstrip line and a cathode connected to a ground potential; and   a second diode having an anode connected to said ground potential and a cathode connected to said microstrip line; and     wherein one, and only one, of said first and second input terminals is selectively connected to said microwave device, thereby causing said protection circuit to be selectively connected to said microwave device.   
     
     
       4. A package in which a microwave device is to be mounted, said package comprising: a first input terminal;   a second input terminal; and   a protection circuit for protecting said microwave device from electrostatic breakdown, said protection circuit comprising; a microstrip line having a length equal to a quarter wavelength at a frequency of an input signal, which is to be inputted to said microwave device;   a terminal connecting said microstrip line to said first input terminal; and   a series connection of a plurality of diodes, the series connection having a first end connected to said microstrip line and a second end connected to a ground potential; and     wherein one, and only one, of said first and second input terminals is selectively connected to said microwave device, thereby causing said protection circuit to be selectively connected to said microwave device.   
     
     
       5. A package in which a microwave device is to be mounted, said package comprising: a protection circuit for protecting said microwave device from electrostatic breakdown, the protection circuit comprising: a microstrip line having a length equal to a quarter wavelength at a frequency of an input signal, which is to be inputted to said microwave device;   a first terminal connected to said microstrip line;   a diode;   a second terminal connecting said diode to said microstrip line;   a third terminal connecting said diode to a ground potential; and   an open stub connected to said second terminal and having a length equal to said quarter wavelength of said input signal; and     at least two input terminals, one of said at least two input terminals being connected to said first terminal of said protection circuit, wherein said one of said at least two input terminals is selectively coupled to said microwave device, thereby causing said protection circuit to be selectively coupled to said microwave device.